kindly anyone help me and solve the problem with complete steps asap.

Problem 12) (2 points): Consider the point set S = {1, 2, ..., 11} UA where A = 14 and An {1, 2, ...,11} = 0. Is it possible for an STS(25) (S, B) (with S as above) to exist if there is a subset B' of the triple set B with the property that the triples in B' collectively contain all pairs of elements in S, except for pairs of the form {a, b} where a, be {1, 2, ..., 11 }